Modern long-range precision cartridge. Optimized for heavy high-BC bullets. Better than .300 Win Mag for extreme range. Rapidly adopted by military and competitors.
Type: Rifle
Introduced: 2018, United States
Parent case: .375 Ruger
Standardization: SAAMI
Bullet diameter: 0.308" (7.82 mm)
Case length: 2.58" (65.53 mm)
Overall length: 3.7" (93.98 mm)
Max pressure: 65,000 PSI
Rim type: Rimless
Primer: Large Rifle Magnum
Typical twist rate: 1:8.5
Muzzle velocity: 2810–3000 fps
Muzzle energy: 3300–4000 ft-lbs
Effective range: 1500 yd
Common bullet weights: 190, 200, 212, 225 gr
Primary use: Target, Competition, Hunting
Production status: Active
Also known as: .300 Precision Rifle Cartridge
History: Introduced by Hornady in 2018 for long-range precision. Designed from ground up for modern heavy bullets unlike belted magnums. Quickly adopted by PRS and military sniper programs. Better case design than .300 Win Mag.
Notable firearms: Ruger Precision Rifle, Bergara HMR, Barrett MRAD, Accuracy International
Similar cartridges: .300 Win Mag, .300 Norma Magnum